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In this investigation, a novel method with high voltage pulsed discharge directly in water was proposed to treat algae. It could produce multiple effects - shock waves, ultraviolet, hydroxyl radicals, strong electric field at the same time. In this article, the killing effects of different alga and two measurement methods were studied. The results showed that the inactivation ratio could reach 100%,...
Medium voltage machines are extensively employed in power generation and industrial applications. In general, they are very reliable with an expected lifetime in the order of 30 to 50 years depending on service class. However, when a machine fails, sometimes unexpectedly, production disruption and downtimes can be very costly. About 50% of failures are related with loss of dielectric strength of the...
This paper addresses the problem of automatic pattern classification in real metallographic images from the steel plant ArcelorMittal Ostrava pic (Ostrava, Czech Republic). Images of manufactured metal plates contain dark dots, i.e. imperfections. We monitor the process quality in the steel plant by determining automatically the number and sizes of these dots which represent plates' imperfections...
We propose the "illumination watermarking" technology with which the images of objects with no copyright protection can contain invisible digital watermarking, using spatially modulated illumination. This technology can be applied to objects without electronically embedded watermarking such as pictures painted by artists. We conducted experiments where one-bit binary data were embedded in...
This paper presents an initial state of the art about the estimation of the sound power emitted by electrical machines. The paper proposes a new method, more accurate, to evaluate the sound power emitted by a PM machine by a 3D FEM mechanical analysis. It also takes into account tangential forces applied on the teeth. Finally the papers shows the impact of any harmonic force in the global emitted...
This paper presents an electronic ballast topology for HID lamps using differential connection of DC/DC converters. The integration of power factor correction, lamp power control and inverter stages results in a single-stage electronic ballast that supplies the lamp with a low frequency symmetrical square voltage waveform, which avoids both the acoustic resonance phenomenon excitation and the lamp...
After a brief introduction about the polarization curve, this paper addresses a new method for correcting the values of measured voltages. By knowing this, it is possible to determinate, by a mathematical regression, the parameters allowing to describe the electrical behavior of a PEM fuel cell system. These parameters, obtained by experimental setup permit a fuel cell stack model to be obtained in...
When a PWM converter starts operation with non zero load, the initial DC-link voltage could not be high enough to generate converter output voltage vector for current regulation. This lack of converter voltage vector could cause unregulated over-current at converter operation start. In this paper, a new current control scheme is proposed for a PWM converter against low DC-link voltage. To avoid unregulated...
This paper explores the main design issues related to power supply infrastructure needed for a vehicle charging system to be implemented in a large parking deck. The design challenges with such a system have been investigated. Simulations have been performed to characterize the chargers as loads and a supply design is proposed. The design components include the sizing of the supply cables and the...
This paper introduced a pulse discharge reactor with a novel electrode configuration for decomposition of phenol in water. A tungsten wire in the middle of the porous ceramic tube and a stainless steel mesh outside the ceramic tube attached to the inner wall of the reactor vessel were constructed as discharge electrode and ground electrode, respectively. The porous ceramic tube made gas phase and...
This paper investigates the use of Ethernet/IP communications protocol for data acquisition and control of electrical networks in an industrial environment. A high-speed communication connection among all the devices operating in a distribution network using breakers, contactors, relays, power meters and other devices may allow a large amount of data to be exchanged to and from an industrial/utilities...
This paper presents a new strategy to improve the applicability of adaptive filters for harmonic detection in shunt active power filters (SAPF). The final objective of the strategy is improving the speed of convergence of the adaptive filter and reduces the steady-state error. Two cases are presented and discussed, one with a Finite Impulse Response (FIR) adaptive filter with 32 coefficients and another...
This paper presents a method for controlling 119W digitized ultraviolet (UV) lamp electronic ballast with chip microprocessor. With this method, power closed loop can be easily realized and protection can also be carried out correctly when malfunctions including open-circuit and short-circuit state occur. Experimental results show that UV-lamp ignites reliably, harmonic content can be controlled below...
Monocular head-mounted displays (HMD) are expected as a core device for ubiquitous computing. However, monocular HMD can decrease the visibility by environment light. High luminance environment light makes high contrast between the environment and images presented by monocular HMD. This situation causes perceptional lost of the images. In this study, the authors examined a LCD backlight control method...
The plasma tubes array is the film display that is able to realize an extra large area emissive display. And it is expected to realize the new industrial applications of wall size display because of its wonderful characteristics such as ultra-thin, light-weight, flexible and low power consumption. We had successfully developed a prototype display of 3 m times 2 m screen size which was consisted of...
Electrostatic atomization technology is useful to produce fine droplets with narrow size distribution. However, droplet production rate has been very low compared to other methods such as solid injection, pneumatic, and rotating. In liquid-in-liquid system, nozzleless droplet formation was proposed using membrane filter and applying electrostatics. The atomization pattern was categorized into three...
This paper presents a Measurement System of Cathodic Currents for copper electrorefining processes using Multicircuital Technology with Optibar intercell bars. The proposed system is based on current estimation using 55 magnetic field sensors per inter-cell bar. Current values are sampled and stored each 5 minutes for 7 days in a compatible SQL database. The method does not affect the normal operation...
This paper presents the study of dynamic interactions between passive filters and high power cycloconverters drives. The dynamic interaction considers the impact of connection and disconnection of passive filters operating in conjunction with high power cycloconverters. The inrush currents generated by filter connection affects the cycloconverter operation. The paper presents a detailed analysis based...
In order to produce high-quality steel products, the electromagnetic stirring (EMS) systems have been extensively applied in the continuous casting process of those integrated steel-making industries. Although the operational principles of such facilities are well established and extensively applied, demonstrations of actual stirring effects on molten metal are always desired for relative investigations...
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